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Astrobiology
Feb 10, 2021
NASA Study:
▪To Find an Extraterrestrial Civilization, Pollution Could Be the Solution
▪If there’s an advanced extraterrestrial civilization inhabiting a nearby star system, we might be able to detect it using its own atmospheric pollution, according to new NASA research.
▪The study looked at the presence of nitrogen dioxide gas (NO2), which on Earth is produced by burning fossil fuels but can also come from non-industrial sources such as biology, lightning, and volcanoes.

Conceptual image of industrial extraterrestial civilization
Artist’s illustration of a technologically advanced exoplanet. The colors are exaggerated to show the industrial pollution, which otherwise is not visible.
Credits: NASA/Jay Freidlander
“On Earth, most of the nitrogen dioxide is emitted from human activity -- combustion processes such as vehicle emissions and fossil-fueled power plants,” said Ravi Kopparapu of NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “In the lower atmosphere (about 10 to 15 kilometers or around 6.2 to 9.3 miles), NO2 from human activities dominate compared to non-human sources. Therefore, observing NO2 on a habitable planet could potentially indicate the presence of an industrialized civilization.”

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